Manufacturer Description:
A classic reborn. The Haible Resonators recreates the 'Resonator' section from the famous Moog Polymoog synthesizer. This circuit was designed by diy synth legend Jurgen Haible.

Features:
Four modes of operation: Lowpass, Bandpass, Notch, and Highpass
Independent Control of Dry Level and Resonator Level
Clip LED Indicator for the Resonator Level
Three Independent Filters
Gain, Cutoff Frequency, and Emphasis Level for Each Filter
Two Audio Inputs
1% Resistors (throughout) and 5% Capacitors (in filter section) for a high level of matching between units
Switchcraft Jacks
Alpha Pots